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Semi-supervised clustering
Semi-supervised clustering is a machine learning method that groups data using must-link and cannot-link constraints or labeled seeds; canonical algorithms include COP-K-Means, seeded k-means, and MPCK-Means.
Semi-supervised learning
Semi-supervised learning is a machine learning approach that trains on a small labeled dataset together with a large unlabeled one, improving accuracy when labels are expensive to obtain.
Semi-trailer
A semi-trailer is a freight trailer whose front rests on a tractor's fifth wheel, so the tractor bears part of its weight; the main North American freight hauler.
Semi-trailer truck
A semi-trailer truck, also called a big rig or articulated lorry, is a truck tractor coupled to a trailer whose weight partly rests on the tractor.
Semi-transparent perovskite solar cell
A semi-transparent perovskite solar cell (ST-PSC) generates electricity from a metal halide perovskite absorber while transmitting visible light, serving solar windows, building-integrated photovoltaics, and tandem solar cells.
SEMICON West
SEMICON West is the flagship North American exposition for the semiconductor supply chain, organized annually by SEMI since 1971 and long held at the Moscone Center in San Francisco.
Semiconducting polymer nanoparticles
Semiconducting polymer nanoparticles (SPNs), also called semiconducting polymer dots, are organic nanoparticles made from light-absorbing semiconducting polymers, used chiefly as imaging agents and for phototherapy.
Semiconductor
A semiconductor is a material, such as silicon, whose electrical conductivity can be tuned over a wide range, and it is the base material for most electronics.
Semiconductor device
A semiconductor device is an electronic component whose operation depends on controlled conduction of a semiconductor such as silicon, from diodes and transistors to integrated circuits.
Semiconductor device fabrication
Semiconductor device fabrication, also called silicon chip fabrication, builds integrated circuits layer by layer on ultrapure silicon wafers, with leading-edge fabs costing billions of dollars.
Semiconductor industry
The semiconductor industry designs and manufactures integrated circuits, the chips in every modern electronic system, operating as a global production chain with sales of $630.5 billion in 2024.
Semiconductor Manufacturing International Corporation
Semiconductor Manufacturing International Corporation (SMIC) is a Chinese semiconductor wafer foundry headquartered in Shanghai and the world's third-largest foundry, founded in 2000 by Richard Chang.
Semiconductor optical amplifier
A semiconductor optical amplifier (SOA) is an electrically pumped semiconductor device that provides optical gain to light signals, working in both 1310 nm and 1550 nm fiber bands.
Semilab
Semilab is a Hungarian metrology equipment maker founded in 1989 by physicists from the Hungarian Academy of Sciences, headquartered in Budapest with subsidiaries across Asia and the United States.
Seminole Electric Cooperative
Seminol Electric Cooperative is a not-for-profit generation and transmission electric cooperative headquartered in Tampa, Florida, serving nine member cooperatives that reach about 2 million people.
Seminole Generating Station
Seminole Generating Station is a coal-fired power station in Putnam County, Florida, operated by Seminole Electric Cooperative, with one 714 MW coal unit after Unit 1 retired in 2024.
Seminole NGL Pipeline
The Seminole NGL Pipeline is a 1,281-mile natural gas liquids pipeline in the United States, running from Hobbs on the Texas-New Mexico border to Mont Belvieu, Texas.
Seminole power station
Seminole power station, officially the Seminole Generating Station, is a 1,701 MW natural-gas-fired plant operated by Oklahoma Gas & Electric at Konawa, Oklahoma, with units from 1971 to 1975.
Semipalatinsk Test Site (Семипалатинский испытательный полигон)
The Semipalatinsk Test Site (Семипалатинский испытательный полигон), known in Kazakhstan as the Polygon, was the Soviet Union's principal nuclear testing ground, hosting 456 nuclear tests from 1949 to 1989.
Semirara Mining and Power
Semirara Mining and Power Corporation is a Philippine company that mines coal on Semirara Island, Antique, and generates power from it, producing most of the country's coal.
Semmering Base Tunnel
The Semmering Base Tunnel (German: Semmering-Basistunnel) is a 27.3 km twin-tube railway tunnel under construction between Gloggnitz and Mürzzuschlag, Austria, with final breakthrough in 2024 and opening planned for 2029.
Semmering Railway
Semmering Railway (Semmeringbahn), Austrian 41 km mountain railway built 1848-1854 by Carl von Ghega, the world's first major mountain railway; UNESCO World Heritage site since 1998 with 14 tunnels and 16 viaducts.
Semnan Space Center
Semnan Space Center, known as the Imam Khomeini Spaceport, is Iran's first permanent satellite launch site in Semnan province, launching Safir, Simorgh, and Zuljanah rockets.
Sempra Infrastructure
Sempra Infrastructure is a Houston-based energy infrastructure company and subsidiary of Sempra that develops LNG export facilities and pipelines in the United States and Mexico.
Sempron
Sempron, also known as AMD Sempron, is a brand of budget x86 processors sold by AMD from 2004 until the early 2010s, competing with Intel's Celeron.
Semrush
Semrush is an online visibility management software platform offering SEO, advertising research, content marketing, and AI visibility tools; founded in 2008, it was acquired by Adobe in 2026.
Semtex
Semtex is a plastic explosive made of PETN and RDX, developed in the late 1950s by chemist Stanislav Brebera in Czechoslovakia and named for Semtín, its Czech production site.
Senboku 1 LNG Terminal
Senboku 1 LNG Terminal (泉北製造所第1工場) is a liquefied natural gas import terminal at the Port of Sakai-Semboku in Osaka Bay, Japan, operated by Osaka Gas since 1972.
Senboku 2 LNG Terminal
Senboku 2 LNG Terminal is an LNG import terminal at the Port of Sakai-Semboku in Osaka, Japan, owned by Osaka Gas and operating since 1977 with a send-out capacity of 9.9 million tonnes per year.
Senboku Natural Gas power plant
The Senboku Natural Gas power plant (泉北天然ガス発電所) is a 1,109 MW liquefied natural gas-fired power station in Sakai and Takaishi, Osaka Prefecture, Japan, owned by Osaka Gas's Daigas Group.